java.lang.NullPointerException: Can't pass null for argument 'pathString' in child()

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java.lang.NullPointerException: Can't pass null for argument 'pathString' in child()
at com.google.firebase.database.g.a(Unknown Source)
at com.test.finalapp.Activities.PreMainActivities.c.a(Unknown Source)
at com.google.firebase.database.p.a(Unknown Source)
at com.google.android.gms.c.ha.a(Unknown Source)
at com.google.android.gms.c.iv.b(Unknown Source)
at com.google.android.gms.c.jb.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:152)
at android.app.ActivityThread.main(ActivityThread.java:5507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

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